Break README into smaller files

The current README.md for the Storytelling Tool repo is very long and difficult to navigate. This is a combination of both the amount of content in the file as well as the formatting of it.

The following should be addressed:

• Examine README files for other large projects on GitHub for some good methods
• Keep only basic info in the README and provide an organized list of links to the other files in the "docs" directory
• Improve the formatting for best readability
• Add any applicable badges such as Licence, Docker build passing/failing, etc.